Steam-trap.



No. 811,420. PATENTED JAN. 30, 1906. E. A. MARSH.

STEAM TRAP.

APPLICATION FILED MAR.20,19U5.

IWVEWTOR v UNITED STATES ran UFFIOE.

ELON A. MARSH, OF DETROIT, MICHIGAN, ASSIGNOR TO THE GREENAWAY COMPANY,OF DETROIT, MICHIGAN, A CORPORATION.

STEAM-TRAP.

Patented Jan. 30, 1906.

Application filed March 20, 1905 Serial No. 250.901.

to the accompanying. drawings, which form a part of this specification.

This invention relates to steam-traps.

It has for its object an improved trap containing an automaticallyopening andclosing main valve primarily started by a pilotvalve that isactuated by a float, and the float is contained in the body of the trapand connected to the pilot-valve by suitable levers and links. ,The mainvalve and the pilotvalve together, when both are closed, form asteam-tight closure across the mouth. of the outlet-pipe, through whichthe accumulated water is to be finally driven out from the trap. Thepilot-valve has but small surface to resist the opening action of thefloat and is easily opened at the proper time, after which the mainvalve is opened by the motive force of the water and the steam-pressurewhich tends to move the water.

In the drawings, Figure 1 is a vertical section through the trap. Thevalve-easing above the tra is shown in elevation. Fig. 2 is a verticasection through the valve-casing of the valve.

1 indicates the rece tacle part of the trap, in which the waters t latare to be separatedv from the steam accumulate.

2 is the inlet-pipe into the trap. clean-out opening and valve therefor.

4 is the exit-pipe, through which. the waters are all driven from thetrap.

5 is an end of pipe dropping from the outflowpipe 4 towar the bottom ofthe receptacle part of the trap and dipping into the accumulatingwaters. At the top of this pipe end 5, between it and the mainoutflow-pipe 4, is a valve-casing 6, inclos'ing a chamber, in which isheld a cylinder-like receptacle 7 for the piston part 8 of a valve thatseats against the pipe surrounding the orifice that leads into theoutflow-pipe 4. The )iston. part 8 of the valve engages easily or ooselyin the cylinder 7 and is provided on the upper side,

3isa

which engages against the valve-seat 10, with a suitable packing gasket1.1. The entire piston part of the valve is bored and at the upper partof the bore the bore contracts to make a seat 12 for a needle-valve 13,that terminates the upper end. of a valve-stem 14. The lower end of thevalve-stem is provided by a slot connection 15 with the end 16 of alever 17. The lever 17 is pivotally suspended by pin 18 from the bottomend of the pipe 5 and supports the float that normally rests on thewater in the trap.

In action the water accumulates in the trap, lifting the float 19 untilthe buoyancy of the float draws down the stem of the needle-valve andopens a assage through the orifice in the seat of tie needle-valve, andthereby allows any water, air, or steam that may have accumulated in thecylinder 7 underneath the valve to escape freely into the passage 4 andreduces the resistance to an opening movement of the main valve by relieving the pressure from the under side of said valve. The pressurewhich is in the valve-chamber external to the cylinder 7 is nowsu'fiicient to drive the piston 8 into the cylinder and. fully open thepassage from the valve-chamber into the pipe 4, and Water is driven. outfrom the trap until its surface has fallen below the bottom of thepipe5. When in this condition, the pressures on the opposite sides ofthe main valve are again equalized, or nearly equalized, and the weightof the float is suflicient to lift the needle-valve and. the main valvewhich now hangs on the end of the needle-valve until the main valvecloses against its seat and the needle valve closes against its seat andthe exit of the trap is closed.

A sightfeed or gage-glass 20, properly connected to the trap, shows thecondition of the water therein at all times.

What I claim is 1. In a steam-trap, a trap-chamber, a valvechamberexternal to the trap-chamber and above the water accumulating spacetherein, a main valve having a central passage, a piston-actuator forsaid valve, a cylinder surrounding said piston open at the top andhaving space for fluid therein under said piston and having dischargefrom said space through the said central passage in the main valve, afluid-discharge pipe depending from the valve-chamber into thewater-aceu1nu lating space of said trap, a pilot-valve for controllingthe passage through the main valve and a float for actuating saidpilotvalve, substantially as described.

, 2. In a steam-trap, a trap-chamber, a valve-chamber external to thetrap-chamber and above the water-accumulating space therein, a mainvalve having a central passage, a piston-actuator for said valve, acylinder surrounding said piston open at the top and having space forfluid therein under said piston and having discharge from said spacethrough the said central passage in the main valve, a fluid-dischargepipe dependingfrom the valve-chamber into the water-accumulating spaceof said trap, a pilot-valve for controlling the passage through the mainvalve and a float for actuating said pilotvalve, a pivot-and-slotconnection between said float and pilot-valve, substantially asdescribed.

In testimony whereof I sign this specification in the presence of twowitnesses.

ELON A. MARSH.

Witnesses:

CHARLES F. BURTON, MAY E. lion.

